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Overview of drilling
- 1. Overview of Drilling LECTURER SYEDNAWAZ Free Lance NDT Inspector Founder of Petroleum Universe
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- 3. Drilling plan • Theobjective is to drill a well safely with a minimum cost and the drilled hole should be usuable • Sequence of well planning should be: – Type of well – Method of drilling – Target location and analysis – Formation characteristics – Well lithology – Mechanical planning – Well completion program – Mud program – Drill string and BHA – Rig selection – Power requirements – Bit Planning – Time
- 4. Types of Well •Wild cat • Exploratory • Step out • Relief or Re-entry well • etc
- 5. Method of drilling •Cable tool drilling • Rotary drilling • Drilling with down hole motors • Top drive drilling • etc
- 6. Target location andanalysis • Vertical well drilling • Directional well drilling • Horizontal well drilling • Slanted well drilling • Drain hole drilling • Curvature drilling • Tangential drilling
- 7. Formation characteristics • Formationpressure • Formation temperature • Formation condition • Formation permeability • Formation porosity • Formation boundaries • Formation fluid equilibrium
- 8. Well lithology • Geologicalstructure • Rock sequence • Aquifer position • Surface soil • Pay zone rock • Fractures/fissures • Gas traps • Geological faults and folds • Formation dipping
- 9. Mechanical planning • Overburdenpressure • Compressive strength • Fracture pressure • Stress failure • Drillability of rocks • Rock consolidation • Rock strength
- 10. Well completion program •Type of well completion – Single – Dual – Multiple string completion • Casing configuration • Casing bit size program • Casing setting depth selection • Casing design • Casing cementing program
- 11. Mud program • Lithologicalanalysis • Formation pressure • Fracture pressure • Density planning • Mud conditioning • Hydraulics impacts • Flow characteristics • Mud thixotropy • Nozzle performance • Type of mud • Functions of mud • Properties of mud
- 12. Drill string andBHA • Drill pipe • Drill collar • Positioning the stabilisers • BHA for Build-up, Drop off and tangential drilling
- 13. Rig selection • Analysisof static and dynamic load • Environmental loading • Derrick load capacity • Derrick efficiency • Hoisting planning • Block and tackle system • Derrick leg foundation and stability • Rig sizing
- 14. Power requirements for •Hoisting power • Circulation power • Rotary power • Accessory power • Requirement of power source- engine, pumps etc • Power transmission devices and their lay outs,etc
- 15. Bit planning • Typeof bit and its suitability • Drilling mechanism of the bits in various formation • Drilling energy of a bit • Cost per foot analysis of drill bits
- 16. GTO • The firststep before spudding any well is well programming • Blue print of well • Guidance to geologists, drillers, mud chemist, etc., • Also called as well on a paper
- 17. GTO includes • GeneralData • Geological Data • Mud Parameters • Drilling Data
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- 24. Thank you For anyqueries : nawaz.delta.au@gmail.com
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